Flash vacuum pyrolysis of lignin model compounds

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Despite the extensive research into the pyrolysis of lignin, the underlying chemical reactions that lead to product formation are poorly understood. Detailed mechanistic studies on the pyrolysis of biomass and lignin under conditions relevant to current process conditions could provide insight into utilizing this renewable resource for the production of chemicals and fuel. Currently, flash or fast pyrolysis is the most promising process to maximize the yields of liquid products (up to 80 wt %) from biomass by rapidly heating the substrate to moderate temperatures, typically 500{degrees}C, for short residence times, typically less than two seconds. To provide mechanistic insight ... continued below

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16 p.

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Cooney, M.J.; Britt, P.F. & Buchanan, A.C. III March 1, 1997.

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Description

Despite the extensive research into the pyrolysis of lignin, the underlying chemical reactions that lead to product formation are poorly understood. Detailed mechanistic studies on the pyrolysis of biomass and lignin under conditions relevant to current process conditions could provide insight into utilizing this renewable resource for the production of chemicals and fuel. Currently, flash or fast pyrolysis is the most promising process to maximize the yields of liquid products (up to 80 wt %) from biomass by rapidly heating the substrate to moderate temperatures, typically 500{degrees}C, for short residence times, typically less than two seconds. To provide mechanistic insight into the primary reaction pathways under process relevant conditions, we are investigating the flash vacuum pyrolysis (FVP) of lignin model compounds that contain a {beta}-ether. linkage and {alpha}- or {gamma}-alcohol, which are key structural elements in lignin. The dominant products from the FVP of PhCH{sub 2}CH{sub 2}OPh (PPE), PhC(OH)HCH{sub 2}OPh, and PhCH{sub 2}CH(CH{sub 2}OH)OPh at 500{degrees}C can be attributed to homolysis of the weakest bond in the molecule (C-O bond) or 1,2-elimination. Surprisingly, the hydroxy-substituent dramatically increases the decomposition of PPE. It is proposed that internal hydrogen bonding is accelerating the reaction.

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16 p.

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OSTI as DE97003489

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  • 213. national meeting of the American Chemical Society, San Francisco, CA (United States), 13-17 Apr 1997

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  • Other: DE97003489
  • Report No.: CONF-970443--10
  • Grant Number: AC05-96OR22464
  • Office of Scientific & Technical Information Report Number: 456348
  • Archival Resource Key: ark:/67531/metadc674903

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  • March 1, 1997

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  • July 25, 2015, 2:21 a.m.

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  • Jan. 22, 2016, 10:50 a.m.

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Cooney, M.J.; Britt, P.F. & Buchanan, A.C. III. Flash vacuum pyrolysis of lignin model compounds, article, March 1, 1997; Tennessee. (digital.library.unt.edu/ark:/67531/metadc674903/: accessed November 12, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.